#pragma once

#include<iostream>
#include<string>
#include<strings.h>
#include<cstring>
#include<unistd.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include"log.hpp"
namespace server
{
    enum{
        USAGE_ERR = 1,
        SOCKET_ERR,
        BIND_ERR,
        LISTEN_ERR
    };

    static const uint16_t gport=8080;
    static const int gbacklog = 5;

    class TcpServer
    {
    public:
        TcpServer(const uint16_t &port=gport):_listensock(-1),_port(port) 
        {}
        void initServer()
        {   
            //1.创建套接字
            _listensock=socket(AF_INET,SOCK_STREAM,0);
            if(_listensock < 0)
            {
                logMessage(FATAL,"create socket error");
                exit(SOCKET_ERR);
            }
            logMessage(NORMAL,"create socket success");

            //2.bind
            struct sockaddr_in local;
            memset(&local,0,sizeof(local));
            local.sin_family = AF_INET;
            local.sin_port = htons(_port);
            local.sin_addr.s_addr = INADDR_ANY;
            if(bind(_listensock,(struct sockaddr*)&local,sizeof(local)) < 0)
            {
                logMessage(FATAL,"bind socket error");
                exit(BIND_ERR);
            }
            logMessage(NORMAL,"bind socket success");

            //3.listen 设置socket为监听状态
            if(listen(_listensock,gbacklog) < 0)
            {
                logMessage(FATAL, "listen socket error");
                exit(LISTEN_ERR);
            }
            logMessage(NORMAL,"listen socket success");

        }
        void start()
        {
            for(;;)
            {
                //4.accept 获取连接
                //sock用来通信的fd
                struct sockaddr_in peer;
                socklen_t len=sizeof(peer);
                int sock = accept(_listensock,(struct sockaddr*)&peer,&len);
                if(sock < 0)
                {
                    logMessage(ERROR,"accept error ,next");
                    continue;
                }
                logMessage(NORMAL,"accept a new link success");
                std::cout<<"sock: "<<sock<<std::endl;

                //5.用sock进行通信，后续都是文件操作
                //version 1
                serviceIO(sock);
                close(sock);
            }
        }
        void serviceIO(int sock)
        {
            char buffer[1024];
            while(true)
            {
                ssize_t n=read(sock,buffer,sizeof(buffer)-1);
                if(n > 0)
                {
                    buffer[n]=0;
                    std::cout<<"recv message: "<<buffer<<std::endl;

                    std::string outbuffer=buffer;
                    outbuffer+="server[echo]";

                    write(sock,outbuffer.c_str(),outbuffer.size());
                }
                else if(n==0)
                {
                    //代表client退出
                    logMessage(NORMAL,"client quit,me too");
                    break;
                }
            }
        }   
        ~TcpServer(){}
    private:
        int _listensock;//用来监听链接到来，获取新链接的
        uint16_t _port;
    };
}